Draft-regulating device for furnaces.



W. P. HALL'DEUD. A. L. HALL, ADMINISTRATRIX. DRAFT 'REGULATING DEVICEFOR FURNACES.

APPLIOATION IYILED JAN. 5, 1910.

Patented July 26, 1910.

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v WITNESSES mwm W. P.- HALL, DEG'IL- A. L. HALL, ADMINISTBATEIX; DRAFTREGULA 'I'ING 1mm]: FOR rumnwns.

Arrmomzon FILED JAN. 5, 1910.

' Patented July 26, 1910.

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WITNESSES INVENTORJ- m.) I: I: Mam/U I? Mma acacia.

acres ieairjai i'r HALL ADMINISTRATRIX 01E SAID W'IJLBER P. HALL,DECEASED.

DRAFT-REGULhTING DEVICE It' UIt FUIttillACES.

Specification of Letters Patent.

Patented July 26, 11910.

Application filed January 5, 1.910. Eerie]. as. 536,518.

To all whom it may concern:

Be it known that I, WILBER P. HALL, a citizen of the United States, andresident of Pembroke, in the county of Genesee and State of New York,have invented certain new and useful Improvements in Draft-1tegulatingDevices for Furnaces, ofwhich the following is a specification.

The present invention relates to an improved draft regulating device forfurnaces, particularly such as are adapted for use in supplying heat toincubators and analogous apparatus.

The essential object of the-invention is the provision of a simple andcompactly arranged medium for increasing or dim1nishing the intensity ofheat produced in the furnace, and thus control the temperature of theincubator to which the furnace is attached, for the purpose ofmaintaining a desirable and steady degree of heat in the in cubator.

The invention resides primarily in an improved damper and cold air doorcombined with the furnace, and opera ting means therefor, and thesedevices are actuated synchronously by changes intemperature of theheating medium.

The invention further consists in certain minor details of constructionand arrangements of parts as will be hereinafter pointed out.

In the accompanying drawings l have illustrated one example of thephysical embodiment of my invention, constructed accordin to the bestmode I have so far devised i or the practical application of theprinciples.

In the drawings, I have exemplified the'iu vention as adapted for useand applied to an incubator, which is heated by hot water, but it willbe understood that the invention is also applicable for other uses Wheredesired.

In the drawings :Figure l is a perspective view showin the inventionapplied for use with an incubator. Fig. 2 is a vertical section throughthe upper part of the fur nace. Fig. 3 is a View similar to Fi 2, butshowin the damper or draft reg-u ator and the cold air door in anotherposition.

Fig. a is a detached perspective View of the operating arm secured tothe cold air door, and Fig. 5 is a perspective view of the damper, andpart of its actuatlng mechanism.

.llange S, and the arm is [is illustrated in the drawings, the furnace Ais constructed a hot-Water heater, and is provided with the supply pipe13 which leads to and enters the incubator C, and after passing throughthe Wall of the incubator as shown, connects with the usual hot watercoils therein, the return pipe leading to the furnace, as usual. Thevertical pipe D which is connected with the supply pipe B, enters theexpansion tank E, in which. is contained a suilicient quantity of oilfor the purpose oi actuating a float or other buoyant device, not shown,which is actuated by the expansion or diminution of the Water in thestand pi e D. A. lever 1 is pivoted on the tank auo at its inner end isconnected in an operative manner with the float, in such manner that itsouter end may be raised or depressed, for a purpose to be described.

Reterring particularly to Figs. 2 and 3 it will be seen that the furnaceis equipped with water jacket (3- Which surrounds the combustion chamberH, and said chamber may be closed at its top by means of the draftregulator or damper I. This damper,

as clearly seen in Fig. 5, is formed with a pair of trunnions ll, one ofwhich is elongated and has attached. thereto a crank arm J, which isconnected by riieans of the rod or link K to the lever arm l abovereferred to. The trunnions form journals for the movement of the damperand are seated in suitable hearings in the plate L which is providedwith an opening or seat M for the damper. The forward. end of the damperis formed with aprojecting hi, or lip N the under face of which isinclined as at O.

The dome l of the furnace is provided With the usual. smoke stack Q, andat its front is recessed for thereception of the hinged cold air door R.'lhe operating arm S, very clearly shown in Fig. 4c, is secured to theinner side oi the door, by means of the so located that its free end isin constant contact with a por tion of the front end. of the damper ll.Thus in Fig. 2, with the damper in closed position, the arm contactswith the lug N, and the door-is the damper raised to open position, theend of the arm islin engagementwith the lower edge of the front endofthe dam er. It will be noted that thejntreme en ofthe arm S is beveledas at T, and this formation facilitates the ire-action olflthe parts ofthetill held open; and in Fig. 3, with lever arm S and damper, andprevents undue friction or obstruction of movement.

The operation of the devices will be evident. When the float in theexpansion tank is lifted, due to expansion of heated water in the pipeD, the outer end of the lever F is depressed; Thus, should thetemperature in the incubator rise to an undesirable degree, theexpansion of the hot water actuates the lever F and rod K, the latterbeing depressed as will be understood, and, through the crank arm J, thedamper I (Fig. 3) is returned to closed position, as in Fig. 2. Themovement of the damper in closing rides down the arm T of the cold airdoor, and the door is thus caused to swing upon its hinges, outwardly.In this manner the draft through the combustion chamber is regulated bythe damper, and the admission of cold air to the dome of the furnace iscontrolled by the movement of the cold air door. When the water, for anyundue reason, becomes dispossessed of a desirable degree of heat, thefloat in the expansion tank falls. This movement lifts the lever F, andthrough the connections, the damper I, permitting a draft through theopening M. The upward movement. of the damper permits the cold air doorto swing,,by gravity, to a closed or partially closed position. Un-' derthese conditions, the intensity of heat in the furnace may be increased,and likewise I the degree of temperature imparted to the Water increasedto provide a desirable atmospheric condition in the incubator.

It will be understood, of course that the movement of the devices, dueto the ex )ansion or contraction of the water, is gradual, and that theadmission of cold air to the dome and the draft from the furnace areregulated in a steady and desirable manner. Under these circumstances,the danger of overheating the eggs contained'in the incubator iseliminated, and a normal degree of heat is maintained therein. 7

From the above description takenin connection with-the drawings, it isevident that I have produced'a device of this character which fulfilsthe conditions requisite for an efficient and reliable regulator.

Having thus fully described my invention, what I claim as new and desireto secure by Letters Patent is I 1. The combination with a furnacehaving a fire chamber provided with a port at. the

upper end, of a damper adapted to fit in and closesaid port, said damperhaving integrally formed pintles thereon journaled in the sides of thefurnace, an undercut lug carried by the edge of the damper, a draft doorcarried by the furnace, an inwardly projecting lug carried by the saiddoor and adapted to engage said lug, and thermostatic means forautomatically opening and clos ing the damper, the closing thereofserving to force the undercut or cam portion of the lug against the lugon the door to force the latter open.

2. In a. breeder remilator, the combination with the brooder, of a coilfor heating the same, a furnace for heating the coil, said furnacehaving an aperture in the top of the fire chamber, a damper for closingsaid aperture, a draft cl1amber above the fire chamber provided with aport, a door for closing said port, a lug carried by the door andengaging the damper, an expansion chamber in the coil, and connectionsbetween said chamber and the damper for closing the latter upon theoverheating of the coil, the damper being provided with a projecting lughaving a cam or sloping face adapted at all times to be in contact. withthe lug carried by the door, the closing of the damper causing the camface of the lug to bear down upon and depress the lug on the door, thusforcing the door open to admit a draft, forcing the door of the draftport open.

3. In a furnace, the combination with the fire pot provided with a port,of a pivotally mounted damper adapted to serve as a closure therefor,thermostatic mcansfor opening and closing said damper, an angular doorcarried by the furnace for controlling the draft opening thereof, aplate secured to the door below its point of pivotence, an in wardlyextending arm or lug carried by the plate and provided with a cam shapedend, and an integral projection on the damper adapted to bear upon saidend to depress the same as the damper is closed. said pressure swingingthe door open to admit a cooling draft.

In testimony whereof I altix my signature in presence of two witnesses.

WILBER P. HALL.

\Vitnesses:

JAMES E. PAXON, WM. L. PAxoN.

